2 years ago

PLEASE HELP

Mathematics

1 answer:

VikaD [51]2 years ago

3 0

Answer:

Step-by-step explanation:

total parts= 3+7=10

12=4 parts

1 part=3

3*3=9

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Solve y=-3x² + 4.5x – 20<br> Use the Quadratic formula

statuscvo [17]

Answer:

$x=0.75 \pm 2.47067i$

Step-by-step explanation:

Quadratic Formula: $x=\frac{-b \pm \sqrt{b^2-4ac} }{2a}$

√-1 is imaginary number i

Step 1: Define

y = -3x² + 4.5x - 20

a = -3

b = 4.5

c = -20

Step 2: Substitute and Evaluate

$x=\frac{-4.5 \pm \sqrt{4.5^2-4(-3)(-20)} }{2(-3)}$

$x=\frac{-4.5 \pm \sqrt{20.25-240} }{-6}$

$x=\frac{-4.5 \pm \sqrt{-219.75} }{-6}$

$x=\frac{-4.5 \pm \sqrt{219.75}(\sqrt{-1} ) }{-6}$

$x=\frac{-4.5 \pm i\sqrt{219.75} }{-6}$

$x=\frac{4.5 \pm i14.824 }{6}$

$x=0.75 \pm 2.47067i$

7 0

3 years ago

I am a 2nd grader i need to know 120/1234x1234x70x0x90x100x12x13x34

maxonik [38]

Anything multiplied by 0 =0
So what is left is 90x100x12x13x34 which is=47,736,000

7 0

3 years ago

Which number is a counting number? Can you do both of them plz

DochEvi [55]

Question 3 is: D. All integers are rational numbers.
Question 4 is: C. the counting number is 4. Hope this helped :)

4 0

2 years ago

If anyone could help me it would be deeply appreciated!

Hunter-Best [27]

Answer

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Step-by-step explanation:

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3 years ago

PLZ HELP ME

Likurg_2 [28]

Answer:

x ≈ 14.87

Step-by-step explanation:

Using Pythagoras' identity in the right triangle.

The square on the hypotenuse is equal to the sum of the squares on the other 2 sides, that is

x² = 10² + 11² = 100 + 121 = 221 ( take the square root of both sides )

x = $\sqrt{221}$ ≈ 14.87 ( to the nearest hundredth )

8 0

2 years ago